Drug interactions
Ephedrine + Isoflurane
Severity: Moderate
Ephedrine and Isoflurane: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Halogenated anesthetics such as isoflurane sensitize the myocardium to catecholamines and indirect sympathomimetics. Ephedrine given during isoflurane anesthesia can provoke ventricular arrhythmias and marked blood pressure swings. The effect is usually less than with halothane but remains relevant.
What this interaction means in plain words
Ephedrine and Isoflurane can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Ephedrine belongs to Cardiovascular; Isoflurane belongs to Central Nervous System.
Why it happens
Volatile anesthetics sensitize the myocardium to adrenergic stimulation, and ephedrine releases norepinephrine and directly stimulates adrenergic receptors.
What to do
Titrate ephedrine in small incremental doses under continuous ECG and blood pressure monitoring. Treat arrhythmias promptly and consider an alternative vasopressor if ventricular ectopy develops.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Isoflurane
Other interactions of Ephedrine
- Ephedrine + Isocarboxazid Contraindicated
- Ephedrine + Phenelzine Contraindicated
- Ephedrine + Procarbazine Contraindicated
- Ephedrine + Rasagiline Contraindicated
- Ephedrine + Selegiline Contraindicated
- Ephedrine + Tranylcypromine Contraindicated
Frequently asked questions
Can I take Ephedrine with Isoflurane?
MediHelp rates the interaction as moderate. Ephedrine and Isoflurane can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Halogenated anesthetics such as isoflurane sensitize the myocardium to catecholamines and indirect sympathomimetics. Ephedrine given during isoflurane anesthesia can provoke ventricular arrhythmias and marked blood pressure swings. The effect is usually less than with halothane but remains relevant.
How serious is the interaction between Ephedrine and Isoflurane?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Titrate ephedrine in small incremental doses under continuous ECG and blood pressure monitoring. Treat arrhythmias promptly and consider an alternative vasopressor if ventricular ectopy develops.
What other medicines interact with Isoflurane?
MediHelp also lists interactions of Isoflurane with, for example, Adrenaline-articaine, Amisulpride, Arsenic trioxide. The full list is on the Isoflurane page.
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